What was found
FO SIDE FLIGHT DECK EMERGENCY ESCAPE WINDOW IS VERY DIFFICULT TO OPEN. GROUNDED - YES. STARTED FO WINDOW ADJUSTMENT PER B737-800 AMM 56-12-11-820-801(12) REPLACED FWD BOTTOM SPECIAL BOLT THREADS RUINED. NEEDS TO BE RETHREADED. REPLACED FWD LOWER ROLLER AND BOLT REF AMM 56-12-11-300-802 OPERATED WINDOW OPEN / CLOSE OK. NO RIGGING WAS PERFORMED IN ACCOMPLISHING TASK REINSTALLED WINDOW TESTED WINDOW HEAT AND PERFORMED OVERHEAT TEST PER AMM 56-12-11-400-801.